2016 Mercedes-Benz S65L AMG

The 2016 Mercedes-Benz S65L AMG is a luxury performance sedan boasting a hand-built 6.0L Twin-Turbo V12 engine producing 621 horsepower and 738 lb-ft of torque. Other engine options for the 2016 S-Class lineup included various V6 and V8 engines, and even a hybrid option. The S65L AMG came exclusively with the AMG Speedshift 7G-Tronic automatic transmission. Owners generally praise its opulent interior, powerful engine, and comfortable ride. Common complaints revolve around high maintenance costs, complex electronics that can be prone to failure, and the car’s sheer size making it difficult to maneuver in tight spaces.

Engine

6.0L Twin-Turbo V12 (M279)

• Oil Leaks
  • Description/Symptoms: Oil leaks, often observed around the valve cover gaskets, oil cooler lines, or turbocharger lines. Can result in visible oil spots under the car, burning oil smell, and low oil levels.
  • Solution: Replace leaking gaskets and seals. For oil cooler lines, replacement of the lines may be necessary. For turbocharger lines, tighten or replace if damaged.
  • Estimated Cost to Fix: $200 - $2000+ depending on the location and severity of the leak.
  • Recalls: None Found
• Ignition Coil Failure
  • Description/Symptoms: Misfires, rough idle, reduced power, check engine light illumination. Often caused by age and heat.
  • Solution: Replace the faulty ignition coil(s). Replacing all coils at once is recommended for preventative maintenance.
  • Estimated Cost to Fix: $200 - $600+ depending on how many need to be replaced and if you DIY.
  • Recalls: None Found
• Turbocharger Issues
  • Description/Symptoms: Reduced power, whistling or whining noises from the engine, check engine light. Possible boost leaks or turbocharger failure.
  • Solution: Diagnose the turbocharger system for leaks or failures. Replace faulty turbocharger(s) as needed.
  • Estimated Cost to Fix: $3000 - $7000+ per turbocharger.
  • Recalls: None Found

Transmission

AMG Speedshift 7G-Tronic

• Harsh Shifting
  • Description/Symptoms: Abrupt or jerky gear changes, especially during downshifts.
  • Solution: Transmission fluid flush and filter replacement. If the problem persists, valve body rebuild or replacement may be necessary.
  • Estimated Cost to Fix: $300 - $800 for fluid flush and filter. $1500 - $4000+ for valve body work.
  • Recalls: None Found
• Torque Converter Failure
  • Description/Symptoms: Shuddering or vibrations at low speeds, particularly during acceleration. Slipping between gears.
  • Solution: Replace the torque converter.
  • Estimated Cost to Fix: $2000 - $5000+
  • Recalls: None Found

Suspension

• AIRMATIC Air Suspension Failure
  • Description/Symptoms: Vehicle sagging on one or more corners, “Visit Workshop” message, compressor running continuously, uneven ride height.
  • Solution: Diagnose and replace leaking air struts, air lines, or the air suspension compressor.
  • Estimated Cost to Fix: $1000 - $3000+ per strut; $500 - $1500+ for compressor replacement.
  • Recalls: None Found
• ABC (Active Body Control) Hydraulic Suspension Leaks
  • Description/Symptoms: Similar symptoms to AIRMATIC failure, but also potentially hydraulic fluid leaks. Can also cause a “red” warning light on the dash.
  • Solution: Diagnose and repair hydraulic leaks, replace accumulators, or replace the ABC pump.
  • Estimated Cost to Fix: $500 - $2000+ per leak; $800 - $2500 for accumulator replacement; $1500 - $4000+ for pump replacement.
  • Recalls: None Found

Electrical

• Battery Drain
  • Description/Symptoms: Dead battery, difficulty starting the car, frequent jump starts.
  • Solution: Diagnose parasitic drain. Common causes include faulty modules (e.g., seat control module, telematics unit) that are not properly shutting down.
  • Estimated Cost to Fix: $200 - $1000+ depending on the cause.
  • Recalls: None Found
• COMAND System Malfunctions
  • Description/Symptoms: Freezing, crashing, unresponsive touchscreen, navigation issues, audio problems.
  • Solution: Software update. If that doesn’t fix the problem, COMAND unit replacement.
  • Estimated Cost to Fix: $100 - $300 for software update; $1500 - $4000+ for COMAND unit replacement.
  • Recalls: None Found
• Sensor Failures (Parking Sensors, Blind Spot Monitoring, etc.)
  • Description/Symptoms: System malfunctions, error messages, inaccurate readings.
  • Solution: Diagnose and replace faulty sensors.
  • Estimated Cost to Fix: $200 - $800+ per sensor.
  • Recalls: None Found

Exterior

• No Issues Found

Interior

• Seat Actuator Failure
  • Description/Symptoms: Seat not adjusting properly.
  • Solution: Replace seat actuator.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found
• Sunroof Issues
  • Description/Symptoms: Sunroof getting stuck or not opening/closing properly.
  • Solution: Repair or replace sunroof motor or mechanism.
  • Estimated Cost to Fix: $300 - $1500+
  • Recalls: None Found

Summary

The 2016 Mercedes-Benz S65L AMG, while offering exceptional performance and luxury, is prone to certain issues. Engine oil leaks and turbocharger problems are common, potentially resulting in substantial repair bills. Suspension problems, particularly with the AIRMATIC or ABC systems, can also be expensive to fix. Electrical gremlins can be frustrating and difficult to diagnose. Overall, while the S65L AMG offers a unique driving experience, potential buyers should be aware of the possibility of high maintenance and repair costs. The severity of the issues can range from minor annoyances to major mechanical failures, with repair costs varying accordingly. Pre-purchase inspections by a qualified mechanic are highly recommended.